Used to express negative feelings; it implies that something is particularly annoying or upsetting. The way he chews with his mouth open just gets under my skin.
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Colloquial Speech
Common in casual conversation; may be inappropriate in formal contexts like business meetings or academic papers. I can't concentrate when she taps her pen; it really gets under my skin.
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Emotional Response
Often used to show the speaker's irritation has an emotional component, not simply a logical one. He's always interrupting me, and it's starting to get under my skin.